Filter



Aug. 26, 1952 MATTE], JR 2,608,302

FILTER Filed Nov. 23, 1949 fiz /07 72130 (five 06 7720/7621 r/ra Patented Aug. 26, 1952 UNITED STATES OFFICE.

Joseph Mattei,Jr.,Chicagm Ill. Application November 23, 1949, atire. 129,936?

The present invention relates to small filtering devices of the kind commonly used on the ends of the suction pipes of pumps for recirculating oils and other liquids in machine tools, but is not confined to that particular use. Such filters comprise, basically, a sleeve formed of a sheet of wire mesh closed at the ends by caps one of which is provided with attachments to connect the filter to a pump.

An object of the invention is to simplify and improve the construction of filters of the aforesaid type, and lower both the cost of production and the maintenance thereof, as well as to improve the operation during use.

A further object of the invention is to produce a simple filter of the aforesaid type that will function equally well with liquids flowing through the same in one direction as in the other direction.

Further objects will become apparent from the following detailed description of the invention, taken in connection with the accompanying drawing, wherein:

Figure 1 is a view, partly in side elevation and partly in section on line l! of Fig. 2, illustrative of a preferred form of the invention; Fig. 2 is a top plan view of the device shown in Fig. l. with the conduit omitted; Fig. 3 is a section taken on line 3-3 of Fig. 1; and Fig. 4 is a side elevational view, on a smaller scale, illustrating a modification.

Referring to Figs. 1 to 3 of the drawing, l is the filtering or strainer element, shown as being formed of fine wire mesh fashioned into the shape of an open ended sleeve. In order to provide a very large filtering area the sheet material is folded back and forth to create a large number of U-shaped, radial vanes 2 separated by V-shaped valleys 3, the closed ends of the Us being outwardly facing. I prefer that the radius of curvature of the outer ends or edges of the vanes be substantially greater than the radius of the bottoms of the valleys, as shown at 4 and 5, respectively.

The ends of the shell are closed by heads 6 and l; the bottom head, 6, being a simple disc having a narrow, upturned flange 8. The upper head has a similar flange. These flanges lie outwardly from the shell and serve mainly to center the disclike gaskets 9 and Ill; although the flanges also prevent the wire mesh from flaring outwardly at the top and bottom. The upper head has a central hub-like part II into which a conduit A may be screwed. At the inner end of member I l is a spider 12 that does not 1 Claim. (01. 210 -170) interferewith the flow of liquid in either direction between the interior of the filter and the conduit. The body portion of the upper head, member II and spider l2 are all in one piece which may conveniently be a die casting. The heads are connected to each other by a tie rod l4 that is screwed at its upper end into the center of the spider, while its lower end extends out through a hole [5 in the lower head. A cap. nut 16 on the rod, outside of the lower head, serves to draw the two heads together and clamp; the strainer member flrmly between them.

Each head has on the inner side two sets of pins 11 and I8; the pins in each set being arranged in a circle that has its center at the axis. of the device. Pins I1 are of such size and are so disposed that they fit into the vanes at the outer rounded edges of the latter. Pins [8, on the other hand, enter and flt in the rounded bottoms of the valleys between the vanes. With this arrangement, the strainer sleeve is firmly anchored against bodily lateral movement or distortion at both ends.

In order to stiffen the shell so as to enable it to withstand forces that might tend to cause it to bulge outwardly or collapse inwardly somewhere in the span between the heads, I prefer to employ a few hoop-like elements to brace the shell. In the arrangement shown, there is a single circular band or hoop IS on the inside, while there are two hoops, 20 and 2|, on the outside; the three hoops being so placed as to divide the distance between the two heads into four equal parts. The hoops may be fastened to the shell by spot welding or in any other suitable manner.

It will be seen that my improved device is extremely simple, consisting of a few sturdy parts that are easy to make and easy to assemble and take apart. It will also be seen that liquids may be pumped through the device in either direction for, notwithstanding the simple construction, the strainer member is so sturdy that it will operate satisfactorily regardless of the direction in which the liquid travels through the filter.

In cases where a lesser area of filtering surface will sufiice, the cost of the device may bev further reduced by substituting a plain cylindrical wire mesh shell for the one made up of vanes-v and valleys. Such a modified structure is shown. in Fig- 4, wherein all parts are the same as in the preferred form, with the exception of the. strainer shell I which is a mere tube or cylinder. It will be seen that pins I! serve the same general purpose in both cases.

While I have illustrated and described with particularity only a single preferred form of my 3 invention, together with a single modification, I do not desire to be limited to the exact details thus illustrated and described, but intend to cover all forms and arrangements that come within the definitions of the invention constituting the appended claim.

I claim:

A filter consisting of the following instrumentalities: two solid heads, a strainer member in the form of an open-ended wire mesh shell dis posed between said heads, and" an axial tie rod connecting said heads together; one of the heads having a large central opening and a spider spanning the same, the other head containing a small.

lar part that surrounds that opening? and is threaded for connection; with a conduit; said shell being in the form of radial. U-shaped vanes alternating, with V-shaped valleys; and. eachhead having. on the, inner side shortintegral pins fit- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,676,024 Hansen July 3, 1928 1,755,482 Lomax Apr. 22, 1930 1,884,615 Dooley Oct. 25, 1932 1,937,415 Sidney Nov. 28, 1933 2,239,868 I Williams Apr. 29, 1941 FOREIGN PATENTS Number Country Date 497,020 Great Britain Dec. 12, 1938 131,135 Germany June 6, 1902 

